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cissoid

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WordReference Random House Unabridged Dictionary of American English © 2025

cis•soid n. [Geom.]

Mathematicsa curve having a cusp at the origin and a point of inflection at infinity. Equation:r= 2a sinθtanθ.

Greek kissoeidé̄s, equivalent. to kiss(ós) ivy + -oeidēs -oid
1650–60

cis•soi′dal, adj.

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